Deprecate integration guides

[pwizla]

This PR informs users that integration pages will soon be removed from the official docs and transferred to https://strapi.io/integrations.

As opposed to the deployment guides (see #2172) these guides are only "deprecated" for now, so they are hidden from the table of content, but still can be found (with search + AI bot).

The next steps will be to:

• actually remove these guides from the docs and transfer them to Strapi's integrations page,
• create the only official integration guide supported by the docs team, about React and possibly Next.js

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 9, 2024 10:07am